Ranking Score Explained

Hi there, thanks for your interest in how we calculate an experience's ranking score. It's at the core of Rankers so I'm pleased you're curious.

The ranking score percentage is used to compare and sort experiences in ranking tables. It is not necessarily a direct measurement of the quality of a particular experience as rated by its customers. I've found it a useful tool to allow me to find the best experiences with confidence. But I've also found it important to read the customer reviews before making any final judgements!

We calculate an experience's ranking score using a multi-factor data model instead of a raw data average (mean). This model takes into account several important questions. For instance - is there a trusted body of reviews? What is the age of a review and is the review from a credible source?

Below you'll find details around some of the important factors that went into calculating the ranking score for Waitomo Glowworm Caves.

If you have any questions or comments about our ranking score calculation please get in touch at info@rankers.co.nz. We don't believe this is perfect or complete so we're always interested in ways we might make improvements.

Nick Morrison's avatar

Nick Morrison

Rankers owner

Waitomo Glowworm Caves

Valid Reviews

288 Valid Reviews

The Waitomo Glowworm Caves experience has a total of 289 reviews. There are 288 valid reviews that are included when calculating the ranking score and 1 invalid review that are excluded from the calculation. Reviews can be excluded only when a reviewer is not verified or after an investigation by our team determines the reviewer is not genuine.

Below is the distribution of ratings for the 288 valid reviews:

Rating Count Percentage
10/10 36
13%
9/10 52
18%
8/10 81
28%
7/10 64
22%
6/10 22
8%
5/10 13
5%
4/10 8
3%
3/10 5
2%
2/10 4
1%
1/10 3
1%

75.66% Average

The raw data average (mean) for all the Waitomo Glowworm Caves valid reviews is 75.66% and is based on 288 valid reviews. This value is not used to calculate the ranking score and it only provided here as a comparison to the weighted average.

Face-to-Face Reviews

263 Face-to-Face Reviews

The Rankers team meets with travellers while they’re in New Zealand and conducts face-to-face surveys. These reviews, in our opinion, are the most trusted in the industry and represent a critical control sample. To our knowledge, we are the only travel review website in the world that has gone to this extent.

More about face-to-face reviews

Within the 288 valid reviews, the experience has 263 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 263 face-to-face reviews:

Rating Count Percentage
10/10 29
11%
9/10 49
19%
8/10 76
29%
7/10 57
22%
6/10 21
8%
5/10 13
5%
4/10 7
3%
3/10 5
2%
2/10 4
2%
1/10 2
1%

75.36% Average

The raw data average (mean) for all the Waitomo Glowworm Caves face-to-face reviews is 75.36% and is based on 263 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.

Weighted Average

76.47%

Rankers calculates a weighted mean as a base average on which we can improve. Individual review's ratings are given a weight based on several factors. The weight of a review determines the overall impact it'll have on the final weighted average.

Recent reviews have more weight as they are more relevant and reflect the experience as it currently operates. Over time reviews become less relevant and loose their impact on the ranking score.

Low rating reviews carry slightly less weight. This dampens the effect of very low ratings for every experience across the board. This is especially important when the experience has few reviews overall and a single negative rating can grossly mischaracterise an experience. Consistent poor reviews will still result in the experience receiving a comparitively low ranking score.

Credible sources provide reviews that can be trusted. If we have verified a reviewer is genuine via a face-to-face meeting then the review carries additional weight.

Reviewer Rating Age Relative Weight
ros fraser 4/10 1212 days 82%
wynden 1/10 1240 days 75%
Rado Hank 10/10 1327 days 100%
Lizzie Edmonds 8/10 1328 days 95%
Anis Quentin 7/10 1335 days 90%
Jeny Smolders 7/10 1339 days 90%
Oscar Petersen 8/10 1346 days 94%
Ani 9/10 1455 days 94%
Martin Murlik 8/10 1567 days 85%
Laura 9/10 1578 days 89%
Melanie Farrell 7/10 1586 days 80%
Andy 10/10 1593 days 88%
Julia Achatz 5/10 1607 days 70%
Auba Mateos 7/10 1613 days 79%
Charlotte 7/10 1613 days 79%
Isabel Zedelius 8/10 1616 days 83%
Dries 8/10 1656 days 81%
Clarissa Glaser 8/10 1657 days 81%
Alna 10/10 1662 days 85%
Holger Worner 9/10 1662 days 85%
Karlee Hormell 9/10 1671 days 85%
Alonso 9/10 1675 days 85%
Rose Guillaume 8/10 1678 days 80%
Caroline Coudray 8/10 1682 days 80%
Barbara 8/10 1682 days 80%
Leonie Brabers 7/10 1690 days 76%
Bina Johansson 10/10 1690 days 84%
Sam Staines 9/10 1694 days 84%
Erik 6/10 1697 days 69%
Nicole Signer 8/10 1704 days 79%
Sam Taylor 7/10 1708 days 75%
Vanuxem 8/10 1912 days 70%
Clara Bertomeu 10/10 1912 days 74%
Lukas Boller 9/10 1914 days 74%
Mette Elholm 7/10 1928 days 67%
Mathilde Arp 8/10 1928 days 70%
Chloe and Guillame 9/10 1932 days 73%
Andre 9/10 1934 days 73%
Doerte 10/10 1934 days 73%
Saskia Peek 9/10 1935 days 73%
Erika Tarant 8/10 1935 days 69%
Jennifer Nguyen 7/10 1936 days 66%
Julie Duvert 7/10 1936 days 66%
Dan Ramsl 4/10 1936 days 57%
Lucy Mulvin 7/10 1937 days 66%
Fine Kochling 9/10 1939 days 73%
Eberhard 9/10 1939 days 73%
Hannes 8/10 1940 days 69%
Calum Penn 9/10 1942 days 73%
Arthur Portolleau 6/10 1943 days 60%
Elisabet 10/10 1944 days 73%
Tommy Mannien 8/10 1945 days 69%
Solange Bourbeois 8/10 1948 days 69%
Talissa Missiato 10/10 1948 days 73%
Severin Knegsch 9/10 1949 days 73%
Pierre Jouffineau 10/10 1950 days 72%
Lewis Whittle 8/10 1952 days 69%
Ben and Pauline 8/10 1954 days 69%
Ann-Kathrin 7/10 1959 days 65%
Natasha Harbinson 10/10 1960 days 72%
Sebastian 2/10 1961 days 53%
Jaquein Bucholz 3/10 1961 days 55%
Chiara 7/10 1961 days 65%
Cariotta Kemper 3/10 1961 days 55%
Megan Lenox 7/10 1964 days 65%
Max Mustermann 8/10 1966 days 68%
Amy Stafford 8/10 1969 days 68%
Carl 7/10 1969 days 65%
Briony 7/10 1971 days 65%
Melanie Kronbichler 8/10 1972 days 68%
Andreas Schiefer 7/10 1973 days 65%
Veronique Kaplan 3/10 1975 days 54%
Robin Ings 6/10 1976 days 59%
Stula Vladimir 7/10 1977 days 65%
David Soukal 8/10 1977 days 68%
Olivia Aliprandi 7/10 1978 days 65%
Isabelle 2/10 1980 days 53%
Jonathan Gourmel 8/10 1980 days 67%
Mikkel Palleson 4/10 1983 days 56%
Franziska and Sabine 7/10 1984 days 64%
Chloe Guerillot 7/10 1984 days 64%
Faye Oliver 7/10 1986 days 64%
Iris Kerbler 9/10 1986 days 71%
Til Schaebitz 6/10 1987 days 58%
Elisabeth Grabner 9/10 1989 days 71%
Berith 10/10 1989 days 71%
Chris Simpson 6/10 1992 days 58%
Pekka and Jonna 9/10 1992 days 71%
Jonas Hoerning 8/10 1993 days 67%
Nils 10/10 1993 days 71%
Mark Rosema 8/10 1994 days 67%
Lisa Huber 10/10 1994 days 71%
Nicola Wiggan 9/10 2015 days 70%
Linda and Gunther 4/10 2016 days 54%
Julie 9/10 2017 days 70%
Maria Schaer 7/10 2021 days 63%
Mette and Jesper 5/10 2023 days 56%
Pierre and Alexandra 6/10 2029 days 57%
Julia Waenninger 8/10 2041 days 65%
Sarah Boettcher 9/10 2077 days 67%
Suzanne Vermeulen 6/10 2094 days 54%
Blandine Giusti 7/10 2297 days 52%
Bart Hanssen 6/10 2376 days 44%
Astrid Egesten 7/10 2428 days 47%
Jean Curry 9/10 2651 days 42%
Carla Oyarzun 1/10 2655 days 29%
Philippe Chiasson 9/10 2661 days 41%
Helma Druyken 4/10 2671 days 32%
Florian Guttler 7/10 2674 days 37%
Casandra Prunica 8/10 2675 days 38%
Lauren Hedley 7/10 2675 days 37%
Janina Zwerver 8/10 2675 days 38%
Marieke Feyteres 4/10 2679 days 31%
van Linda Werner 5/10 2679 days 32%
Philip Donachie 7/10 2689 days 36%
Luisa Bach 8/10 2689 days 38%
Kristina 7/10 2691 days 36%
Eugen Lehner 6/10 2692 days 33%
Manuel Bach 7/10 2692 days 36%
Matthias Freiling 2/10 2699 days 29%
Debora Grusler 6/10 2702 days 32%
Andreas Brodhaeker 8/10 2715 days 37%
Renee van der Syde 7/10 2716 days 35%
Martha Horst 8/10 2716 days 37%
Roland Beer 7/10 2720 days 35%
Johanna Bak 4/10 2720 days 30%
Lior Bakski 9/10 2730 days 38%
Bet 9/10 2731 days 38%
Memain 8/10 3004 days 24%
Konza 7/10 3005 days 23%
Steen Rausmussen 8/10 3036 days 23%
David Restell 10/10 3066 days 23%
Christina Rodewald 9/10 3071 days 23%
Hanneke P 7/10 3097 days 20%
Kohler 9/10 3117 days 21%
Alexandra van den Brack 6/10 3125 days 17%
Paul Lawrence 9/10 3126 days 21%
Abby Rushmer 7/10 3127 days 18%
Stephan Olivier 7/10 3132 days 18%
Stephan Olivier 7/10 3132 days 18%
Faassen 8/10 3136 days 19%
Julie Lamart 8/10 3137 days 19%
Adrian Weidell 5/10 3333 days 9%
Jonathan Tuthill 9/10 3388 days 9%
A Ormsby 10/10 3400 days 8%
Gillian Rowe 10/10 3413 days 8%
Ryan Pynappels 8/10 3414 days 7%
Peter Dellen 8/10 3415 days 7%
Jorg Steffens 8/10 3415 days 7%
Danielle & Jobbe 9/10 3417 days 8%
Christina 6/10 3418 days 6%
Jop Veldhuis 7/10 3418 days 7%
Paul Weidenfeld 8/10 3419 days 7%
Sophie Dorrepaal 7/10 3419 days 7%
Fannette Peyreplane 5/10 3420 days 6%
Norm Cooper 7/10 3424 days 6%
Gloria, Rose & An 8/10 3424 days 7%
A Sorg 10/10 3424 days 7%
Samplonius 5/10 3427 days 5%
Petra 10/10 3427 days 7%
Bethany Hamilton 8/10 3431 days 7%
suffolkhouse69 9/10 3432 days 7%
a a 8/10 3463 days 5%
Julia Balionis 7/10 3477 days 4%
Julia Hartman 3/10 3478 days 3%
Fabienne Indergand 7/10 3498 days 3%
Waldemar Schuler 9/10 3510 days 4%
pepette31 7/10 3585 days 0%
Craig Hathaway 9/10 3737 days 20%
Stephane Lebel 9/10 3742 days 20%
Rens Hemselmans 7/10 3755 days 18%
Isabell 10/10 3757 days 20%
Holly Cave 5/10 3757 days 16%
J Palmer 6/10 3761 days 16%
Liz & Jim 10/10 3763 days 20%
Edgar & Marilyn Berry 9/10 3765 days 20%
Simon Vickers 2/10 3768 days 14%
Leslie 8/10 3781 days 19%
Jean-Francois Guilbault 8/10 3782 days 19%
Selina Mueller 7/10 3783 days 18%
Tamlin Barton 3/10 3784 days 15%
Cara Dungay 8/10 3785 days 19%
Bottcher 10/10 3785 days 20%
Alexandra 10/10 3786 days 20%
Philipp Rau 7/10 3788 days 18%
Dan Aldridge 9/10 3790 days 20%
John Allen 8/10 3792 days 19%
Curtis Penner 8/10 3792 days 19%
Brandt 8/10 3794 days 19%
Nadia Husain 5/10 3797 days 16%
T J Andrews 6/10 3813 days 16%
Charli Skinner 7/10 4064 days 18%
Carl_Larsen 10/10 4073 days 20%
Susan & Richard 10/10 4134 days 20%
Rik 9/10 4135 days 20%
Jonathan Martin 7/10 4137 days 18%
Gunda G 9/10 4142 days 20%
Aaron 8/10 4144 days 19%
Will Jemma 6/10 4147 days 16%
Christen Hans 10/10 4148 days 20%
Monica and Danie. 7/10 4156 days 18%
Stephen 5/10 4158 days 16%
Susan 10/10 4158 days 20%
snodge 8/10 4162 days 19%
Bo Moenstead 9/10 4171 days 20%
Alain Deslandres 8/10 4175 days 19%
Jakob Jurgen 10/10 4176 days 20%
EA Anders 8/10 4179 days 19%
Helen and Hans Walser 1/10 4182 days 14%
kevinp 8/10 4205 days 19%
warrenp 9/10 4209 days 20%
braunweiler 9/10 4213 days 20%
pimn 9/10 4218 days 20%
asiacritics 7/10 4224 days 18%
Chris Mackamul 8/10 4231 days 19%
Debbie Rathbone 10/10 4231 days 20%
Lisette X 9/10 4232 days 20%
Martin 10/10 4234 days 20%
Thomas Willi 10/10 4234 days 20%
Elodie 7/10 4235 days 18%
richardh 7/10 4349 days 18%
trvlbug 8/10 4377 days 19%
glennandjen 10/10 4438 days 20%
BryonyS 9/10 4456 days 20%
Marion 9/10 4473 days 20%
Mikey 7/10 4473 days 18%
Richard Komzik 6/10 4474 days 16%
Michael Walsall 10/10 4478 days 20%
Anna 8/10 4493 days 19%
Abigail 7/10 4493 days 18%
lannie 7/10 4502 days 18%
SimonR 8/10 4502 days 19%
SonjaG 7/10 4502 days 18%
Chris 8/10 4509 days 19%
AurelieD 8/10 4515 days 19%
Yunker 10/10 4517 days 20%
Andrew 8/10 4519 days 19%
Erin 9/10 4519 days 20%
Christopher Gallaga 8/10 4525 days 19%
Amy 10/10 4531 days 20%
Shona 8/10 4531 days 19%
plumbaum 9/10 4533 days 20%
Sandra 10/10 4541 days 20%
Evangelista 8/10 4541 days 19%
Oliver 5/10 4543 days 16%
Kat 9/10 4573 days 20%
Lisa 8/10 4600 days 19%
siobhan 8/10 4602 days 19%
Alice 8/10 4602 days 19%
NORTZ 7/10 4630 days 18%
Stefan 8/10 4632 days 19%
Hugh Trenchard 9/10 4648 days 20%
Niamh 4/10 4655 days 15%
Jenny 9/10 4679 days 20%
Louise 8/10 4688 days 19%
Peddy 10/10 4698 days 20%
Katie Wise 8/10 4701 days 19%
Thomas Bachmann 8/10 4717 days 19%
Daniala 8/10 4736 days 19%
Tom Ben 9/10 4839 days 20%
Sarah Maudsley 8/10 4854 days 19%
Alan Bellerby 8/10 4854 days 19%
Tina Daly 5/10 4860 days 16%
John Woodrow 8/10 4869 days 19%
Ernst Seter 9/10 4869 days 20%
Jim Curley 7/10 4880 days 18%
Daniel 7/10 4881 days 18%
Marc Hertogs 7/10 4884 days 18%
Laura Sutton 5/10 4908 days 16%
Jeroen 5/10 4910 days 16%
Mum! 6/10 4910 days 16%
Gail 9/10 4914 days 20%
Heike Julia 6/10 4915 days 16%
Lanni 8/10 4915 days 19%
Amanda Finger 7/10 4916 days 18%
Desiree Muri 7/10 4916 days 18%
Jan Grzejik 8/10 4943 days 19%
Wouter Ewalts 8/10 4950 days 19%
Matilde 6/10 4958 days 16%
Kim 6/10 5155 days 16%
Gillian 8/10 5197 days 19%
Denise Nick 6/10 5207 days 16%
ranker_110 8/10 5226 days 19%
Jasper 7/10 5233 days 18%
Mary 8/10 5233 days 19%
Lucy 6/10 5233 days 16%
Lukas 8/10 5244 days 19%
Hanna 7/10 5246 days 18%

Adjustments

Several adjustments to the weighted average are added to improve relevancy and credibility. These adjustments apply equally to all experiences that meet the criteria.

Sample Size Adjustment

No Adjustment

A reasonable number of reviews are necessary in order for the average to be credible and for an experience to take a prime position within the ranking tables. As such, experiences with only a few reviews have a moderated score. This does not mean that the experience or the reviews can't be trusted. The Waitomo Glowworm Caves experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-2.10% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 120 days. However the Waitomo Glowworm Caves experience does not meet the criteria for any adjustment.

In addition, an experience's ranking score may be adjusted for each day there is no new ranking. After 1 day the adjustment comes into effect. The maximum number of days that can be adjusted for is 200 days. Due to the seasonal nature of many businesses, this adjustment is applied dynamically throughout the year.

The Waitomo Glowworm Caves experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -2.06%
198 -2.07%
199 -2.09%
200 -2.10%
201 -2.11%
202 -2.12%
203 -2.13%

Final Ranking Score

74%

The final ranking score once adjustments and rounding has been applied. This value is cached and recalculated each day. Therefore it may not be precisely accurate based on the other values presented.

If you have any questions or comments about our ranking score calculation please get in touch at info@rankers.co.nz.